2018650021 has 4 divisors (see below), whose sum is σ = 2019697344. Its totient is φ = 2017602700.

The previous prime is 2018650001. The next prime is 2018650027. The reversal of 2018650021 is 1200568102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2018650021 - 2¹¹ = 2018647973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2018650027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520765 + ... + 524626.

It is an arithmetic number, because the mean of its divisors is an integer number (504924336).

Almost surely, 2^2018650021 is an apocalyptic number.

It is an amenable number.

2018650021 is a deficient number, since it is larger than the sum of its proper divisors (1047323).

2018650021 is a wasteful number, since it uses less digits than its factorization.

2018650021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047322.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 2018650021 is about 44929.3892791789. The cubic root of 2018650021 is about 1263.8251985231.

It can be divided in two parts, 20186 and 50021, that added together give a palindrome (70207).

The spelling of 2018650021 in words is "two billion, eighteen million, six hundred fifty thousand, twenty-one".